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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Apr Wed 21, 2021 9:21 pm 
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Location: victoria bc canada
Pictured rheostats all the same brand and all are at 0.8ohm , the original ones in the radio are all at 0.8ohm . im unsure of transformers its been a while ,im unsure because i cant read the punched numbers to test? the ones in my deforest d10 gave me a fit....


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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Apr Wed 21, 2021 9:56 pm 
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Location: S. Dartmouth MA 02748-1225 USA
beast775 wrote:
Pictured rheostats all the same brand and all are at 0.8ohm , the original ones in the radio are all at 0.8ohm . im unsure of transformers its been a while ,im unsure because i cant read the punched numbers to test? the ones in my deforest d10 gave me a fit....
Um, that does not sound right, it is rare that less than one ohm used and it would control several tubes in the radio... Check the ohmmeter used or try another ohmmeter... chas

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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Apr Wed 21, 2021 11:39 pm 
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Location: victoria bc canada
Did all readings at 1k 0.8 ohms , tried again at 10k and it reads 2. my ohmeter is cheap, digital wont work on rheostats im pretty sure, i did try it and there was 1500 for a second on digital.


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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Apr Thu 22, 2021 12:12 am 
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If you can borrow another ohmmeter try measuring the rheostats again. However, 2 ohms sounds correct for a rheostat used with a 1 amp tube... If the three spare rheostats also measure 2 ohms there is no point in using them either. When the power supply is connected, the effect of the existing rheostats will be known...

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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Apr Thu 22, 2021 8:06 am 
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Location: victoria bc canada
I was going to see if there was any static from the headphone jacks, but im unsure where to plug them in, but after looking at most Reinartz schematics, im more than confused..i thought i needed a few wire contacts on the front panel from the detector to the amp..and the 3- 1/4 inch jacks on the front have me scratchin my head.


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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Jul Tue 13, 2021 1:56 am 
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Joined: Nov Wed 09, 2011 3:55 am
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Location: victoria bc canada
Update....original .Federal No -20 transformers..Secondaries are good-primarys are open.new .replacements? i have 2 good 1920s transformers Erla 6-1,kellog 3-1 but wont fit..should i just make a new platform and start anew? leave the original amp-till i can get the transformers rewired.... got 2 good grid leaks with condensors.finally bought a arbe iii needed one for the last 35yrs :oops: .


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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Jul Tue 13, 2021 5:32 am 
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Yes, a new breadboard to fit the larger transformers.

Scratching the head, why grid leak(s) this is an Amp not a detector...

You see the chart above is for the correct value of rheostats to use.

I note you have an analog meter. Great!

Chas

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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Jul Tue 13, 2021 6:01 am 
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Joined: Nov Wed 09, 2011 3:55 am
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Location: victoria bc canada
G,day Chas and everyone , the grid leak is for the detector- if i need one ? .., it had only a dubilier micadon 1921 .00025mfd when i got it....i will go to a buddys place and cut a platform, i have a few panels i can cut- use for the new face-platform, im wanting this radio to stay almost the way it was built in 1921,but want to use it until i find someone to wind the original coils, leave it correct,no hurry... so a new old 1920s amp platform will be built, i have all the parts ?part of the knowledge. been studying alot. thank you. will update when i get everything on the platform.


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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Jul Tue 13, 2021 1:30 pm 
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Location: Boston, Massachusetts
You can always replace the cores with new ones from ArbeIII or AES inside the metal shells of the federal, to keep it original looking.

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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Jul Wed 14, 2021 9:36 pm 
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Location: victoria bc canada
Hi MRX , im aware of doing that , which would you recommend ?


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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Jul Wed 14, 2021 10:04 pm 
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Location: Boston, Massachusetts
beast775 wrote:
Hi MRX , im aware of doing that , which would you recommend ?


I like the ARBE III (its made in the USA), but the AES version is less expensive. Probably wont make much of a difference since you only have 2 stages of amplification. You could also find some good cores from older transformers.

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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Jul Wed 14, 2021 10:52 pm 
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Location: victoria bc canada
OK , weve got Hammond in Canada , im sure i can get something from them..just have to figure out which model?





Mark.


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 Post subject: Re: Homebuild Reinartz tuner amp.
PostPosted: Jul Wed 14, 2021 11:44 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Boston, Massachusetts
Hammond makes these: https://www.hammfg.com/electronics/tran ... sic/118944

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